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library IEEE;
use IEEE.std_logic_1164.all;
entity clock is
port(
interval: in time;
EN : in std_logic;
CLK : out std_logic
);
end clock;
architecture behave of clock is
begin
clock : process
begin
loop
exit when EN = '0';
CLK <= not '1';
wait for interval;
CLK <= not '0';
wait for interval;
end loop;
CLK <= '0';
wait until EN = '1';
end process;
end architecture;
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